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Chemical Engineering

Prepare with the best Chemical Engineering MCQs with answers and detailed explanations for exams and job tests. Our collection covers key topics such as chemical process calculations, thermodynamics, fluid mechanics, heat transfer, mass transfer, reaction engineering, instrumentation, and plant design. These Chemical Engineering multiple-choice questions are ideal for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, PEC exams, GATE, university entry tests, and job interviews. Practice online with updated Chemical Engineering MCQs to strengthen your concepts and improve technical problem-solving skills.

7951. If helium is introduced in a reactor containing O₂, SO₂ and SO₃ at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO₃ (as per Le Chatlier principle)

Decreases

Increases

Remains unaltered

Changes unpredictably

✅ The correct answer is option A.

7952. For a __________ order reaction, the units of rate constant and rate of reaction are the same.

Zero

First

Second

Fractional

✅ The correct answer is option A.

7953. A catalyst is said to be a negative catalyst, ifit

Retards the rate of reaction

Reduces the value of equilibrium constant

Does not initiate the reaction

All of the above

✅ The correct answer is option A.

7954. Exposure of a photographic plate to produce a latent image is an example of __________ reaction.

Very slow

Very fast

Photochemical

Both B and C

✅ The correct answer is option D.

7955. Rate constant ‘k’ and absolute temperature ‘T’ are related by collision theory (for bimolecular) as

k ∝ T1.5

k ∝ exp(-E/RT)

k ∝ √T

k ∝ T

✅ The correct answer is option C.

7956. Promoter.

Initiates a chemical reaction and is a catalyst by itself

Atlers the position of equilibrium in a reversible reaction

Increases the number of active centres by increasing the unevenness of catalyst surface and by creating discontinuities in the crystals

All of the above

✅ The correct answer is option C.

7957. Fluidised bed reactor is characterised by

Uniformity of temperature

Comparatively smaller equipment

Very small pressure drop

Absence of continuous catalyst regeneration facility

✅ The correct answer is option A.

7958. Which of the following will favour the reverse reaction in a chemical equilibrium reaction?

Increasing the concentration of one of the reactants

Increasing the concentration of one or more of the products

Removal of at least one of the products at regular interval

None of these

✅ The correct answer is option B.

7959. Which of the following is used for calcination of limestone and dolomite in industrial practice?

Fluidised bed reactor

Moving bed reactor

Fixed bed reactor

None of these

✅ The correct answer is option B.

7960. The residence time distribution of an ideal CSTR is

1/τ exp (-t/τ)

Τ exp (-t/τ)

Exp(-t/τ)

1/τ (-t/τ)

✅ The correct answer is option C.